CVE-2020-17022: Microsoft Windows 10 RCE Vulnerability

CVE-2020-17022 Overview

A remote code execution vulnerability exists in the way that Microsoft Windows Codecs Library handles objects in memory. An attacker who successfully exploited this vulnerability could execute arbitrary code on the target system. Exploitation of the vulnerability requires that a program process a specially crafted image file, making this a user-interaction dependent attack vector that could be delivered through phishing campaigns or malicious websites hosting weaponized images.

Critical Impact

Successful exploitation allows attackers to execute arbitrary code with the privileges of the current user, potentially leading to complete system compromise if the user has administrative privileges.

Affected Products

• Microsoft Windows 10 version 1709
• Microsoft Windows 10 version 1803
• Microsoft Windows 10 version 1809
• Microsoft Windows 10 version 1903
• Microsoft Windows 10 version 1909
• Microsoft Windows 10 version 2004

Discovery Timeline

• October 16, 2020 - CVE-2020-17022 published to NVD
• February 23, 2026 - Last updated in NVD database

Technical Details for CVE-2020-17022

Vulnerability Analysis

This vulnerability resides within the Microsoft Windows Codecs Library, which is responsible for processing and rendering various image formats within Windows applications. The flaw stems from improper memory handling when processing specially crafted image files. When the codecs library parses malicious image data, it fails to properly validate or handle certain memory operations, creating conditions that allow an attacker to corrupt memory in a controlled manner.

The attack requires local access with user interaction—specifically, the victim must open or preview a malicious image file. This could occur through various delivery mechanisms including email attachments, downloaded files from compromised websites, or images embedded in documents. Applications that utilize the Windows Codecs Library to render images are potential attack surfaces.

Root Cause

The vulnerability originates from incorrect handling of objects in memory within the Windows Codecs Library. When processing image files, the library fails to properly manage memory allocations and deallocations, leading to a condition where memory corruption can occur. This improper memory management creates an exploitable condition that attackers can leverage to gain code execution.

Attack Vector

The attack requires local access where a victim must interact with a malicious image file. An attacker would typically:

1. Craft a specially malformed image file designed to trigger the memory corruption
2. Deliver the malicious image to the target through email, web download, or file sharing
3. Wait for the victim to open or preview the image using an application that leverages the Windows Codecs Library
4. Upon processing the image, the vulnerability is triggered, allowing arbitrary code execution

The attack does not require elevated privileges from the attacker, but the impact is constrained by the privileges of the user who opens the malicious file. If the victim has administrative rights, the attacker gains full system control.

The vulnerability manifests when the Windows Codecs Library processes malformed image data, leading to memory corruption. For detailed technical analysis, refer to the Microsoft Security Advisory CVE-2020-17022.

Detection Methods for CVE-2020-17022

Indicators of Compromise

• Unexpected crashes in applications processing image files, particularly those using Windows Codecs Library components
• Anomalous child processes spawned from image viewing or processing applications
• Memory access violations or exceptions logged in Windows Event Viewer related to codec operations
• Suspicious image files with malformed headers or unusual file structures

Detection Strategies

• Deploy endpoint detection rules to monitor for unusual process creation chains originating from image processing applications
• Implement file integrity monitoring on critical system directories where codec DLLs reside
• Configure behavioral analysis to detect memory corruption exploitation patterns such as heap spraying or ROP chain execution
• Monitor for execution of shell commands or PowerShell from image viewer process contexts

Monitoring Recommendations

• Enable Windows Event Logging for Application Crashes and Windows Error Reporting to capture codec-related failures
• Implement network monitoring to detect potential delivery of malicious image files via email or web traffic
• Deploy SentinelOne's behavioral AI engine to detect exploitation attempts in real-time through memory protection capabilities
• Monitor for suspicious file downloads with image extensions from untrusted sources

How to Mitigate CVE-2020-17022

Immediate Actions Required

• Apply the Microsoft security update addressing CVE-2020-17022 immediately on all affected Windows 10 systems
• Review and restrict user permissions to minimize the impact of potential exploitation
• Enable Microsoft Defender Exploit Guard and Attack Surface Reduction rules to provide additional protection layers
• Educate users about the risks of opening image files from untrusted sources

Patch Information

Microsoft has released a security update that addresses the vulnerability by correcting how the Microsoft Windows Codecs Library handles objects in memory. The patch is distributed through Windows Update and the Microsoft Update Catalog. Organizations should consult the Microsoft Security Advisory CVE-2020-17022 for detailed patch information and deployment guidance.

Since this vulnerability affects components delivered through the Microsoft Store, ensure that automatic updates for Store apps are enabled, or manually update the HEVC Video Extensions and HEIF Image Extensions from the Microsoft Store.

Workarounds

• Disable automatic preview of images in email clients and file browsers where possible
• Configure email gateways to strip or quarantine image attachments from external sources pending scan
• Restrict execution of applications that process untrusted image content in high-privilege contexts
• Consider application whitelisting to prevent unauthorized processes from executing if exploitation occurs

# Verify HEVC Video Extensions version in PowerShell
Get-AppxPackage -Name Microsoft.HEVCVideoExtension | Select-Object Name, Version

# Check for pending Microsoft Store updates
# Navigate to Microsoft Store > Downloads and updates > Get updates